Improvement in stove-pipe-elbow machines



l H. FISHER. STOVE-PIPE ELBOW-MACHINE;

Patented June13,1876.

N- PETEHS, PHOTOLITHGGRAPMER. WASHINGTON. D C.

UNITED S'rA'rs HENRY FISHER, OF CINCINNATI, OHIO, ASSIGNOR OF ONE-HALF HIS RIGHT TO JOHN M. JOHANNIGMAN, OF SAME PLACE.

IMPROVEMENT IN STOVE-PIPE-ELBOW MACHINES.

Specification forming part of Letters Patent No. 178,519, dated June 13, 1876; application filed October 14, 1875.

lTo all whom vit may concern:

Beit known that I, HENRY FISHER, of Oineinnati, in the county of Hamilton and State of Ohio, have 'invented certain new and use` fnl Improvements in Sheet-Metal-Elbow Maperiphery, whether it be expanded or contracted, and at the same time approximating a complete circle in bothpositions by expand ing equally around its circumference; also, in the shape of the collar to which the head is attached, and from a xed point on which it oscillates when folding over the metal.

In the annexed drawings, Figure l is a longitudinal sectional elevation ofa machine with my invention applied thereto. Fig. 2 is a plan of the expansible oscillating head with the inner collar removed, showing the head as it appears when contracted. Fig. 3 is a plan of the same with the head expanded. Fig. 4 is a sectional elevation through line fr m of Fig. 3, showing the head expanded and laid over the end of the collar above referred to. Fig.

5 is a section through one of the joints of the expansible ring. Fig. 6 is a' perspective view of the collar with the mandrel removed.

In the machine, as represented in Fig. 1, a hollow mandrel, A, is mounted on shears B. A rack, O, slides in ways on shears B, the rack being secured to sleeve E, and is controlled by the pawl attachment I). The pipe to be bent is passed over the head L, collar F, and sleeve E, the seam of the pipe being left unfastened, for the purpose presently to be explained. The collar F and sleeve E being of the same diameter as the inside of said pipe, the pipe can be firmly held at any desired point by the cam-lever G, when it will be ready to feed up to the crimper. In the collar F is formed a semicireular concavity, I, gradually diminishing in size, and extending about threefourths around the circumference ofthe collar, where it terminates, as shown in Fig. 6. On the clamps H a male part, J, is made to fit into said concavity, when thev clamps are closed and held tightly together, and by this means an inward tuck is made in that part of the pipe covering the groove. The pipe is then moved forward by the rack l until it reaches that part of the collar F indicated by the letter K, the pipe being sprung apart at the seam in order to unlock it from the groove J, when the head L is expanded by turning the lever M, which controls the cam V, by means of a hollow shaft, W', connected with the head L, at m, in such a manner as to allow the head to oscillatewhile it is being moved over the collar F by the lever O, eccentric Q, and rod U.

When the head L is expanded,`as before described, the clamps S are locked together, tightly clutching the periphery of the head and relieving it from strain. The rim N of the head L is then brought in contact with the aforesaid tuek, and moved forward over that part of the collar F indicated by the letter K, carrying with it the tuck, and completely folding it over.v The operation of crimping and folding over is repeated until the pipe has received the desired curve.

In the expansible head L the cam V is represented as having four points, al a? a3 a4, acting upon the expansible ring, which is also represented in four segments, bl b2 b3 b4, al-

though it is obvious in both cases this number might be changed without affecting the working utility of the ring.- These segments are jointed toA each other at c1 c2 c3 c4 in such a manner as to allow of afree expansion. The pinjoining the segments b2 and b4 works in a slot in segment b2., which permits the ring to A expand. The cam V is connected to the said ring by a strap from segment b2 to point a2.

The strap e is fitted with a slot at one end, in which the pin that connects it with the segment aforesaid moves while the ring is eX- panded or contracted. IVhen the ring is' contraeted the points al a2 a3 a4 of the canl V are moved into the spaces Il d2 d3 d4, as shown in Fig. 2, and when the ring is expanded the points a1 a2 a3 a4 are bearing upon the four Y keeping the pipe from expanding.

The pipe, being creased before it is riveted,-

Will spring apart when the crease is being removed irom the groove in which it was made.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination of the ,ring F, having groove I and former K, with clamps H J, substantially as and for the purpose speciied.

2. The oscillating expansible head, constructcd with cam V, having impinging points a1 a2 a3 a, connected segments b1 b2 b3 b4, recesses d1 d2 d3 d, and projections f1 f2 f3 f4, with the rim 1N of the head tting over the collar F at K,

substantially as and for the purpose specified. In testimony whereof I have hereunto set myhand this 25th day of September, 1875.

HENRY FISHER.

Witnesses JOHN M. FISHER, HENRY MILLWARD. 

